1. Department of Physical Medicine and Rehabilitation, Charlotte Institute of Rehabilitation, Carolinas HealthCare System, Charlotte, NC, USA
2. R. Stuart Dickson Institute for Health Studies, Carolinas HealthCare System, Charlotte, NC, USA
3. Department of Physical Medicine and Rehabilitation, The Ohio State University, Columbus, OH, USA
4. Kessler Medical Rehabilitation Research and Education Corporation, West Orange, NJ, USA
5. Department of Physical Medicine and Rehabilitation, Santa Clara Valley Medical Center, San Jose, CA, USA
6. Department Rehabilitation Medicine, University of Pennsylvania, Philadelphia, PA, USA